Muscle force depends on the amount of transversal muscle loading.
Muscle force depends on the amount of transversal muscle loading.
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肌肉力量取决于横向肌肉负荷的大小
DOI：
10.1016/j.jbiomech.2014.03.029
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发表时间：
2014
影响因子：
2.4
通讯作者：
R. Blickhan
中科院分区：
文献类型：
--
作者：
T. Siebert;O. Till;N. Stutzig;M. Günther;R. Blickhan
骨骼肌嵌入在其他肌肉、结缔组织和骨骼的环境中，这可能会将横向力传递到肌肉组织，从而压缩肌肉组织。在最近的一项研究中，我们证明了1.3 N cm− 2的肌肉横向载荷分别使最大等长力（Fim）和力发展率降低约5%和25%。本研究的目的是研究增加横向肌肉负荷对收缩动力学的影响。因此，我们对大鼠腓肠肌内侧肌（n=9）进行了无和有五种不同横向负荷的等长实验，对应于肌肉和负荷之间接触区域的压力增加1.3 N cm-2至5.3 N cm-2。肌肉负荷由一个可横向移动的活塞引起，增加横向肌肉负荷导致肌肉力从4.8±1.8%下降到12.8±2%Fim，几乎呈线性下降。与无负荷等长收缩相比，肌肉负荷1.3 N cm− 2时的力发展率为20.2±4.0%，而5.3 N cm− 2时的力发展率为34.6±5.7%。此外，施加横向载荷的肌肉打开了一个窗口，分析三维肌肉力量的产生。本研究中提供的数据对于开发和验证肌肉模型可能很重要，这些模型能够模拟压缩下的肌肉收缩并启发背后的机制。
Skeletal muscles are embedded in an environment of other muscles, connective tissue, and bones, which may transfer transversal forces to the muscle tissue, thereby compressing it. In a recent study we demonstrated that transversal loading of a muscle with 1.3 N cm−2reduces maximum isometric force (Fim) and rate of force development by approximately 5% and 25%, respectively. The aim of the present study was to examine the influence of increasing transversal muscle loading on contraction dynamics.Therefore, we performed isometric experiments on ratM.gastrocnemiusmedialis(n=9) without and with five different transversal loads corresponding to increasing pressures of 1.3 N cm−2to 5.3 N cm−2at the contact area between muscle and load. Muscle loading was induced by a custom-made plunger which was able to move in transversal direction.Increasing transversal muscle loading resulted in an almost linear decrease in muscle force from 4.8±1.8% to 12.8±2%Fim. Compared to an unloaded isometric contraction, rate of force development decreased from 20.2±4.0% at 1.3 N cm−2muscle loading to 34.6±5.7% at 5.3 N cm−2.Experimental observation of the impact of transversal muscle loading on contraction dynamics may help to better understand muscle tissue properties. Moreover, applying transversal loads to muscles opens a window to analyze three-dimensional muscle force generation. Data presented in this study may be important to develop and validate muscle models which enable simulation of muscle contractions under compression and enlighten the mechanisms behind.
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DOI：
10.1080/10255842.2012.675056
发表时间：
2014-02
影响因子：
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